Chemical Engineering · all questions

Chemical Reaction Engineering
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Q161

The reason why a catalyst increases the rate of reaction is that, it

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Q162

A reversible liquid phase endothermic reaction is to be carried out in a plug flow reactor. For minimum reactor volume, it should be operated such that the temperature along the length

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Q163

__________ catalytic reaction is involved in the thermal cracking of gas oil.

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Q164

A gaseous reactant is introduced in a mixed reactor of 3 litres volume at the rate of 1 litre/second. The space time is __________ seconds.

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Q165

In the reversible reaction of the type, A + B ⇋ AB, in general

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Q166

Which of the following is not a dimension-less group used in catalysis? (where, D = dispersion co-efficient, cm²/sec. D₁ = diffusion co-efficient, cm²/sec. L = length of the reactor, cm. t = time, sec, v = volumetric flow rate, cm³/sec. V = volume, cm³.)

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Q167

Holding time for flow reactors is __________ the space time, for constant fluid density

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Q168

Given,
3H₂ + CO = CH₄ + H₂O, K_P = 10^1.84 and 4H₂ + CO₂ = CH₄ + 2H₂O, K_P = 10^1.17
the K_P for the reaction CO + H₂O = CO₂ + H₂ is

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Q169

Rate of a chemical reaction is not affected by the

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Q170

Semibatch reactor is preferred, when a/an

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Q171

6 gm of carbon is burnt with an amount of air containing 18 gm oxygen. The product contains 16.5 gms CO₂ and 2.8 gms CO besides other constituents. What is the degree of conversion on the basis of disappearance of limiting reactant?

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Q172

Signal normally used to study non-ideal flow by stimulus response technique is __________ input.

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Q173

If in the gaseous phase reaction, N₂O₄ ⇋ 2NO₂, x is the part of N₂O₄ which dissociates, then the number of molecules at equilibrium will be

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Q174

Kinetics of a catalytic reaction can be best studied on a/an __________ reactor.

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Q175

Fluidised bed reactor is characterised by

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Q176

At a given value of E/R (ratio of activation energy and gas constant), the ratio of the rate constants at 500°K and 400°K is 2, if Arrhenious law is used. What will be this ratio, if transition state theory is used with the same value of E/R?

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Q177

If ΔG (free energy change) for a chemical reaction is very large and negative, then the reaction is

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Q178

Transition state theory relates the above quantities as

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Q179

Velocity of a chemical reaction

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Q180

Which of the following will favour the reverse reaction in a chemical equilibrium reaction?

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